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kernel-fxtec-pro1x/sound/soc/at91/eti_b1_wm8731.c
Andrew Victor c21098ea56 [ARM] 4912/2: [AT91] Endrelia audio driver must use GPIO interface 
The SoC audio driver for the Endrelia ETI_B1 board should not access
the PIO controller directly, but must rather use the AT91 GPIO
interface.

(This is updated version of patch with removed trailing whitespace)

Signed-off-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-04-10 14:57:19 +01:00

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/*
* eti_b1_wm8731 -- SoC audio for AT91RM9200-based Endrelia ETI_B1 board.
*
* Author: Frank Mandarino <fmandarino@endrelia.com>
* Endrelia Technologies Inc.
* Created: Mar 29, 2006
*
* Based on corgi.c by:
*
* Copyright 2005 Wolfson Microelectronics PLC.
* Copyright 2005 Openedhand Ltd.
*
* Authors: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
* Richard Purdie <richard@openedhand.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <asm/hardware.h>
#include <asm/arch/gpio.h>
#include "../codecs/wm8731.h"
#include "at91-pcm.h"
#include "at91-ssc.h"
#if 0
#define DBG(x...) printk(KERN_INFO "eti_b1_wm8731: " x)
#else
#define DBG(x...)
#endif
static struct clk *pck1_clk;
static struct clk *pllb_clk;
static int eti_b1_startup(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai;
struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
int ret;
/* cpu clock is the AT91 master clock sent to the SSC */
ret = cpu_dai->dai_ops.set_sysclk(cpu_dai, AT91_SYSCLK_MCK,
60000000, SND_SOC_CLOCK_IN);
if (ret < 0)
return ret;
/* codec system clock is supplied by PCK1, set to 12MHz */
ret = codec_dai->dai_ops.set_sysclk(codec_dai, WM8731_SYSCLK,
12000000, SND_SOC_CLOCK_IN);
if (ret < 0)
return ret;
/* Start PCK1 clock. */
clk_enable(pck1_clk);
DBG("pck1 started\n");
return 0;
}
static void eti_b1_shutdown(struct snd_pcm_substream *substream)
{
/* Stop PCK1 clock. */
clk_disable(pck1_clk);
DBG("pck1 stopped\n");
}
static int eti_b1_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai;
struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
int ret;
#ifdef CONFIG_SND_AT91_SOC_ETI_SLAVE
unsigned int rate;
int cmr_div, period;
/* set codec DAI configuration */
ret = codec_dai->dai_ops.set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
if (ret < 0)
return ret;
/* set cpu DAI configuration */
ret = cpu_dai->dai_ops.set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
if (ret < 0)
return ret;
/*
* The SSC clock dividers depend on the sample rate. The CMR.DIV
* field divides the system master clock MCK to drive the SSC TK
* signal which provides the codec BCLK. The TCMR.PERIOD and
* RCMR.PERIOD fields further divide the BCLK signal to drive
* the SSC TF and RF signals which provide the codec DACLRC and
* ADCLRC clocks.
*
* The dividers were determined through trial and error, where a
* CMR.DIV value is chosen such that the resulting BCLK value is
* divisible, or almost divisible, by (2 * sample rate), and then
* the TCMR.PERIOD or RCMR.PERIOD is BCLK / (2 * sample rate) - 1.
*/
rate = params_rate(params);
switch (rate) {
case 8000:
cmr_div = 25; /* BCLK = 60MHz/(2*25) = 1.2MHz */
period = 74; /* LRC = BCLK/(2*(74+1)) = 8000Hz */
break;
case 32000:
cmr_div = 7; /* BCLK = 60MHz/(2*7) ~= 4.28571428MHz */
period = 66; /* LRC = BCLK/(2*(66+1)) = 31982.942Hz */
break;
case 48000:
cmr_div = 13; /* BCLK = 60MHz/(2*13) ~= 2.3076923MHz */
period = 23; /* LRC = BCLK/(2*(23+1)) = 48076.923Hz */
break;
default:
printk(KERN_WARNING "unsupported rate %d on ETI-B1 board\n", rate);
return -EINVAL;
}
/* set the MCK divider for BCLK */
ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, AT91SSC_CMR_DIV, cmr_div);
if (ret < 0)
return ret;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
/* set the BCLK divider for DACLRC */
ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai,
AT91SSC_TCMR_PERIOD, period);
} else {
/* set the BCLK divider for ADCLRC */
ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai,
AT91SSC_RCMR_PERIOD, period);
}
if (ret < 0)
return ret;
#else /* CONFIG_SND_AT91_SOC_ETI_SLAVE */
/*
* Codec in Master Mode.
*/
/* set codec DAI configuration */
ret = codec_dai->dai_ops.set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
if (ret < 0)
return ret;
/* set cpu DAI configuration */
ret = cpu_dai->dai_ops.set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
if (ret < 0)
return ret;
#endif /* CONFIG_SND_AT91_SOC_ETI_SLAVE */
return 0;
}
static struct snd_soc_ops eti_b1_ops = {
.startup = eti_b1_startup,
.hw_params = eti_b1_hw_params,
.shutdown = eti_b1_shutdown,
};
static const struct snd_soc_dapm_widget eti_b1_dapm_widgets[] = {
SND_SOC_DAPM_MIC("Int Mic", NULL),
SND_SOC_DAPM_SPK("Ext Spk", NULL),
};
static const char *intercon[][3] = {
/* speaker connected to LHPOUT */
{"Ext Spk", NULL, "LHPOUT"},
/* mic is connected to Mic Jack, with WM8731 Mic Bias */
{"MICIN", NULL, "Mic Bias"},
{"Mic Bias", NULL, "Int Mic"},
/* terminator */
{NULL, NULL, NULL},
};
/*
* Logic for a wm8731 as connected on a Endrelia ETI-B1 board.
*/
static int eti_b1_wm8731_init(struct snd_soc_codec *codec)
{
int i;
DBG("eti_b1_wm8731_init() called\n");
/* Add specific widgets */
for(i = 0; i < ARRAY_SIZE(eti_b1_dapm_widgets); i++) {
snd_soc_dapm_new_control(codec, &eti_b1_dapm_widgets[i]);
}
/* Set up specific audio path interconnects */
for(i = 0; intercon[i][0] != NULL; i++) {
snd_soc_dapm_connect_input(codec, intercon[i][0],
intercon[i][1], intercon[i][2]);
}
/* not connected */
snd_soc_dapm_set_endpoint(codec, "RLINEIN", 0);
snd_soc_dapm_set_endpoint(codec, "LLINEIN", 0);
/* always connected */
snd_soc_dapm_set_endpoint(codec, "Int Mic", 1);
snd_soc_dapm_set_endpoint(codec, "Ext Spk", 1);
snd_soc_dapm_sync_endpoints(codec);
return 0;
}
static struct snd_soc_dai_link eti_b1_dai = {
.name = "WM8731",
.stream_name = "WM8731 PCM",
.cpu_dai = &at91_ssc_dai[1],
.codec_dai = &wm8731_dai,
.init = eti_b1_wm8731_init,
.ops = &eti_b1_ops,
};
static struct snd_soc_machine snd_soc_machine_eti_b1 = {
.name = "ETI_B1_WM8731",
.dai_link = &eti_b1_dai,
.num_links = 1,
};
static struct wm8731_setup_data eti_b1_wm8731_setup = {
.i2c_address = 0x1a,
};
static struct snd_soc_device eti_b1_snd_devdata = {
.machine = &snd_soc_machine_eti_b1,
.platform = &at91_soc_platform,
.codec_dev = &soc_codec_dev_wm8731,
.codec_data = &eti_b1_wm8731_setup,
};
static struct platform_device *eti_b1_snd_device;
static int __init eti_b1_init(void)
{
int ret;
struct at91_ssc_periph *ssc = eti_b1_dai.cpu_dai->private_data;
if (!request_mem_region(AT91RM9200_BASE_SSC1, SZ_16K, "soc-audio")) {
DBG("SSC1 memory region is busy\n");
return -EBUSY;
}
ssc->base = ioremap(AT91RM9200_BASE_SSC1, SZ_16K);
if (!ssc->base) {
DBG("SSC1 memory ioremap failed\n");
ret = -ENOMEM;
goto fail_release_mem;
}
ssc->pid = AT91RM9200_ID_SSC1;
eti_b1_snd_device = platform_device_alloc("soc-audio", -1);
if (!eti_b1_snd_device) {
DBG("platform device allocation failed\n");
ret = -ENOMEM;
goto fail_io_unmap;
}
platform_set_drvdata(eti_b1_snd_device, &eti_b1_snd_devdata);
eti_b1_snd_devdata.dev = &eti_b1_snd_device->dev;
ret = platform_device_add(eti_b1_snd_device);
if (ret) {
DBG("platform device add failed\n");
platform_device_put(eti_b1_snd_device);
goto fail_io_unmap;
}
at91_set_A_periph(AT91_PIN_PB6, 0); /* TF1 */
at91_set_A_periph(AT91_PIN_PB7, 0); /* TK1 */
at91_set_A_periph(AT91_PIN_PB8, 0); /* TD1 */
at91_set_A_periph(AT91_PIN_PB9, 0); /* RD1 */
/* at91_set_A_periph(AT91_PIN_PB10, 0);*/ /* RK1 */
at91_set_A_periph(AT91_PIN_PB11, 0); /* RF1 */
/*
* Set PCK1 parent to PLLB and its rate to 12 Mhz.
*/
pllb_clk = clk_get(NULL, "pllb");
pck1_clk = clk_get(NULL, "pck1");
clk_set_parent(pck1_clk, pllb_clk);
clk_set_rate(pck1_clk, 12000000);
DBG("MCLK rate %luHz\n", clk_get_rate(pck1_clk));
/* assign the GPIO pin to PCK1 */
at91_set_B_periph(AT91_PIN_PA24, 0);
#ifdef CONFIG_SND_AT91_SOC_ETI_SLAVE
printk(KERN_INFO "eti_b1_wm8731: Codec in Slave Mode\n");
#else
printk(KERN_INFO "eti_b1_wm8731: Codec in Master Mode\n");
#endif
return ret;
fail_io_unmap:
iounmap(ssc->base);
fail_release_mem:
release_mem_region(AT91RM9200_BASE_SSC1, SZ_16K);
return ret;
}
static void __exit eti_b1_exit(void)
{
struct at91_ssc_periph *ssc = eti_b1_dai.cpu_dai->private_data;
clk_put(pck1_clk);
clk_put(pllb_clk);
platform_device_unregister(eti_b1_snd_device);
iounmap(ssc->base);
release_mem_region(AT91RM9200_BASE_SSC1, SZ_16K);
}
module_init(eti_b1_init);
module_exit(eti_b1_exit);
/* Module information */
MODULE_AUTHOR("Frank Mandarino <fmandarino@endrelia.com>");
MODULE_DESCRIPTION("ALSA SoC ETI-B1-WM8731");
MODULE_LICENSE("GPL");
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